<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>一个小网页</title>
</head>
<style>
    body{
        height: 100%;
        width: 100%;
        background-color: #96ceb4;
    }
    .circle{
        top: 50%;
        left:50%;
        margin-top: -250px;
        margin-left: -250px;
        border-radius: 50%;
        position: absolute;

        width: 500px;
        height: 500px;
        background-color: rgb(90, 172, 131);
    }
    .circle>img{
        height: 100%;
        width: 100%;
        border-radius: 50%;
    }
</style>
<body>
    <div class="choose">
        <div class="circle">
            <img src="img/6.jpg" alt="">
        </div>
    </div>
</body>
</html>